From: Gerd Hoffmann <kraxel@redhat.com>
To: Subrata Modak <subrata@linux.vnet.ibm.com>
Cc: ltp-list <ltp-list@lists.sf.net>, Arnd Bergmann <arnd@arndb.de>,
Ralf Baechle <ralf@linux-mips.org>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [LTP] [PATCH] Add preadv01 test for preadv() and pwritev() syscall
Date: Fri, 12 Jun 2009 15:44:44 +0200 [thread overview]
Message-ID: <4A325BCC.2020701@redhat.com> (raw)
In-Reply-To: <20090612132112.32049.92495.sendpatchset@subratamodak.linux.ibm.com>
Hi,
> + * Reference: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=601cc11d054ae4b5e9b5babec3d8e4667a2cb9b5
Look at the commit message again ...
> +static ssize_t preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset)
> +{
> + uint32_t pos_high = (offset>> 32)& 0xffffffff;
> + uint32_t pos_low = offset& 0xffffffff;
> +
> + return syscall(__NR_preadv, fd, iov, iovcnt, pos_high, pos_low);
> +}
No.
#define HALF_BITS (sizeof(unsigned long)*4)
return syscall(__NR_preadv, fd, iov, iovcnt, offset,
(offset >> HALF_BITS) >> HALF_BITS);
Likewise for pwritev.
Also note that latest glibc has preadv/pwritev support, so you could use
that instead.
cheers,
Gerd
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next prev parent reply other threads:[~2009-06-12 14:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-12 13:21 [LTP] [PATCH] Add preadv01 test for preadv() and pwritev() syscall Subrata Modak
2009-06-12 13:44 ` Gerd Hoffmann [this message]
2009-06-15 19:15 ` Subrata Modak
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